| Y1 = 40.35 + 0.47X1 + 1.49X2 + 2.71X3 − 0.27X1X2 − 0.21X1X3 + 0.59X2X3 − 2.97X12 − | (1) |
| 2.93X22 − 0.91X32 | |
| Y2 = 0.30 + 0.034X1 − 0.001X2 − 0.047X3 + 0.016X1X2 − 0.031X1X3 + 0.011 X2X3 + 0.016X12 | (2) |
| + 0.025X22 + 0.030X32 |
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